adjective giddier -·dier, giddiest -·di·est

1. feeling dizzy or unsteady
2. causing or likely to cause dizziness a giddy height
3. turning or circling around very rapidly; whirling
4. 1. inconstant; fickle
   2. frivolous; flighty; heedless

Etymology: ME gidie < OE gydig, insane, prob. < base (*gud) of god, god + -ig (see -y): hence, basic meaning “possessed by a god”

transitive verb, intransitive verb giddied -·died, giddying -·dy·ing